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<div class="title">NonBlockingThreadPool.h</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// This file is part of Eigen, a lightweight C++ template library</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// for linear algebra.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// Copyright (C) 2016 Dmitry Vyukov &lt;dvyukov@google.com&gt;</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">// This Source Code Form is subject to the terms of the Mozilla</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">// Public License v. 2.0. If a copy of the MPL was not distributed</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160; </div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#ifndef EIGEN_CXX11_THREADPOOL_NONBLOCKING_THREAD_POOL_H</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#define EIGEN_CXX11_THREADPOOL_NONBLOCKING_THREAD_POOL_H</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160; </div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &quot;./InternalHeaderCheck.h&quot;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceEigen.html">Eigen</a> {</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Environment&gt;</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="keyword">class </span>ThreadPoolTempl : <span class="keyword">public</span> Eigen::ThreadPoolInterface {</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;  <span class="keyword">typedef</span> <span class="keyword">typename</span> Environment::Task Task;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;  <span class="keyword">typedef</span> RunQueue&lt;Task, 1024&gt; Queue;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160; </div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;  ThreadPoolTempl(<span class="keywordtype">int</span> num_threads, Environment env = Environment())</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;      : ThreadPoolTempl(num_threads, true, env) {}</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160; </div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;  ThreadPoolTempl(<span class="keywordtype">int</span> num_threads, <span class="keywordtype">bool</span> allow_spinning,</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;                  Environment env = Environment())</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;      : env_(env),</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;        num_threads_(num_threads),</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;        allow_spinning_(allow_spinning),</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;        thread_data_(num_threads),</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;        all_coprimes_(num_threads),</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;        waiters_(num_threads),</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        global_steal_partition_(EncodePartition(0, num_threads_)),</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;        blocked_(0),</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;        spinning_(0),</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        done_(false),</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        cancelled_(false),</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        ec_(waiters_) {</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    waiters_.resize(num_threads_);</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    <span class="comment">// Calculate coprimes of all numbers [1, num_threads].</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    <span class="comment">// Coprimes are used for random walks over all threads in Steal</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="comment">// and NonEmptyQueueIndex. Iteration is based on the fact that if we take</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;    <span class="comment">// a random starting thread index t and calculate num_threads - 1 subsequent</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="comment">// indices as (t + coprime) % num_threads, we will cover all threads without</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="comment">// repetitions (effectively getting a presudo-random permutation of thread</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="comment">// indices).</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    eigen_plain_assert(num_threads_ &lt; kMaxThreads);</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 1; i &lt;= num_threads_; ++i) {</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;      all_coprimes_.emplace_back(i);</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;      ComputeCoprimes(i, &amp;all_coprimes_.back());</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    }</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="preprocessor">#ifndef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    init_barrier_.reset(<span class="keyword">new</span> Barrier(num_threads_));</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    thread_data_.resize(num_threads_);</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; num_threads_; i++) {</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;      SetStealPartition(i, EncodePartition(0, num_threads_));</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;      thread_data_[i].thread.reset(</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;          env_.CreateThread([<span class="keyword">this</span>, i]() { WorkerLoop(i); }));</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    }</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="preprocessor">#ifndef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    <span class="comment">// Wait for workers to initialize per_thread_map_. Otherwise we might race</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    <span class="comment">// with them in Schedule or CurrentThreadId.</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    init_barrier_-&gt;Wait();</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;  }</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160; </div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  ~ThreadPoolTempl() {</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    done_ = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160; </div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    <span class="comment">// Now if all threads block without work, they will start exiting.</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="comment">// But note that threads can continue to work arbitrary long,</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <span class="comment">// block, submit new work, unblock and otherwise live full life.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    <span class="keywordflow">if</span> (!cancelled_) {</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;      ec_.Notify(<span class="keyword">true</span>);</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;      <span class="comment">// Since we were cancelled, there might be entries in the queues.</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;      <span class="comment">// Empty them to prevent their destructor from asserting.</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;      <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; thread_data_.size(); i++) {</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        thread_data_[i].queue.Flush();</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;      }</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    }</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    <span class="comment">// Join threads explicitly (by destroying) to avoid destruction order within</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="comment">// this class.</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; thread_data_.size(); ++i)</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;      thread_data_[i].thread.reset();</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;  }</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160; </div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;  <span class="keywordtype">void</span> SetStealPartitions(<span class="keyword">const</span> std::vector&lt;std::pair&lt;unsigned, unsigned&gt;&gt;&amp; partitions) {</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    eigen_plain_assert(partitions.size() == <span class="keyword">static_cast&lt;</span>std::size_t<span class="keyword">&gt;</span>(num_threads_));</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160; </div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    <span class="comment">// Pass this information to each thread queue.</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; num_threads_; i++) {</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;      <span class="keyword">const</span> <span class="keyword">auto</span>&amp; pair = partitions[i];</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;      <span class="keywordtype">unsigned</span> start = pair.first, <a class="codeRef" href="../group__Core__Module.html#ga0e45b6b2adead7c6a29815b99f9f14dd">end</a> = pair.second;</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;      AssertBounds(start, <a class="codeRef" href="../group__Core__Module.html#ga0e45b6b2adead7c6a29815b99f9f14dd">end</a>);</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;      <span class="keywordtype">unsigned</span> val = EncodePartition(start, <a class="codeRef" href="../group__Core__Module.html#ga0e45b6b2adead7c6a29815b99f9f14dd">end</a>);</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;      SetStealPartition(i, val);</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    }</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;  }</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160; </div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;  <span class="keywordtype">void</span> Schedule(std::function&lt;<span class="keywordtype">void</span>()&gt; fn) EIGEN_OVERRIDE {</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    ScheduleWithHint(std::move(fn), 0, num_threads_);</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;  }</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160; </div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;  <span class="keywordtype">void</span> ScheduleWithHint(std::function&lt;<span class="keywordtype">void</span>()&gt; fn, <span class="keywordtype">int</span> start,</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;                        <span class="keywordtype">int</span> limit)<span class="keyword"> override </span>{</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    Task t = env_.CreateTask(std::move(fn));</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    PerThread* pt = GetPerThread();</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    <span class="keywordflow">if</span> (pt-&gt;pool == <span class="keyword">this</span>) {</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;      <span class="comment">// Worker thread of this pool, push onto the thread&#39;s queue.</span></div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;      Queue&amp; q = thread_data_[pt-&gt;thread_id].queue;</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;      t = q.PushFront(std::move(t));</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;      <span class="comment">// A free-standing thread (or worker of another pool), push onto a random</span></div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;      <span class="comment">// queue.</span></div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;      eigen_plain_assert(start &lt; limit);</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;      eigen_plain_assert(limit &lt;= num_threads_);</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;      <span class="keywordtype">int</span> num_queues = limit - start;</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;      <span class="keywordtype">int</span> rnd = Rand(&amp;pt-&gt;rand) % num_queues;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;      eigen_plain_assert(start + rnd &lt; limit);</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;      Queue&amp; q = thread_data_[start + rnd].queue;</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;      t = q.PushBack(std::move(t));</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    }</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    <span class="comment">// Note: below we touch this after making w available to worker threads.</span></div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    <span class="comment">// Strictly speaking, this can lead to a racy-use-after-free. Consider that</span></div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <span class="comment">// Schedule is called from a thread that is neither main thread nor a worker</span></div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    <span class="comment">// thread of this pool. Then, execution of w directly or indirectly</span></div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    <span class="comment">// completes overall computations, which in turn leads to destruction of</span></div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <span class="comment">// this. We expect that such scenario is prevented by program, that is,</span></div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;    <span class="comment">// this is kept alive while any threads can potentially be in Schedule.</span></div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;    <span class="keywordflow">if</span> (!t.f) {</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;      ec_.Notify(<span class="keyword">false</span>);</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;      env_.ExecuteTask(t);  <span class="comment">// Push failed, execute directly.</span></div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    }</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;  }</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160; </div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;  <span class="keywordtype">void</span> Cancel() EIGEN_OVERRIDE {</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    cancelled_ = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    done_ = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160; </div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    <span class="comment">// Let each thread know it&#39;s been cancelled.</span></div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;<span class="preprocessor">#ifdef EIGEN_THREAD_ENV_SUPPORTS_CANCELLATION</span></div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; thread_data_.size(); i++) {</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;      thread_data_[i].thread-&gt;OnCancel();</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    }</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160; </div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    <span class="comment">// Wake up the threads without work to let them exit on their own.</span></div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;    ec_.Notify(<span class="keyword">true</span>);</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;  }</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160; </div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;  <span class="keywordtype">int</span> NumThreads() const EIGEN_FINAL { <span class="keywordflow">return</span> num_threads_; }</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160; </div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;  <span class="keywordtype">int</span> CurrentThreadId() const EIGEN_FINAL {</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    <span class="keyword">const</span> PerThread* pt = <span class="keyword">const_cast&lt;</span>ThreadPoolTempl*<span class="keyword">&gt;</span>(<span class="keyword">this</span>)-&gt;GetPerThread();</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    <span class="keywordflow">if</span> (pt-&gt;pool == <span class="keyword">this</span>) {</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;      <span class="keywordflow">return</span> pt-&gt;thread_id;</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;      <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    }</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;  }</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160; </div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;  <span class="comment">// Create a single atomic&lt;int&gt; that encodes start and limit information for</span></div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;  <span class="comment">// each thread.</span></div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;  <span class="comment">// We expect num_threads_ &lt; 65536, so we can store them in a single</span></div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;  <span class="comment">// std::atomic&lt;unsigned&gt;.</span></div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;  <span class="comment">// Exposed publicly as static functions so that external callers can reuse</span></div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;  <span class="comment">// this encode/decode logic for maintaining their own thread-safe copies of</span></div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;  <span class="comment">// scheduling and steal domain(s).</span></div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kMaxPartitionBits = 16;</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kMaxThreads = 1 &lt;&lt; kMaxPartitionBits;</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160; </div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;  <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> EncodePartition(<span class="keywordtype">unsigned</span> start, <span class="keywordtype">unsigned</span> limit) {</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;    <span class="keywordflow">return</span> (start &lt;&lt; kMaxPartitionBits) | limit;</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;  }</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160; </div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;  <span class="keyword">inline</span> <span class="keywordtype">void</span> DecodePartition(<span class="keywordtype">unsigned</span> val, <span class="keywordtype">unsigned</span>* start, <span class="keywordtype">unsigned</span>* limit) {</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;    *limit = val &amp; (kMaxThreads - 1);</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;    val &gt;&gt;= kMaxPartitionBits;</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    *start = val;</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;  }</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160; </div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;  <span class="keywordtype">void</span> AssertBounds(<span class="keywordtype">int</span> start, <span class="keywordtype">int</span> <a class="codeRef" href="../group__Core__Module.html#ga0e45b6b2adead7c6a29815b99f9f14dd">end</a>) {</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;    eigen_plain_assert(start &gt;= 0);</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;    eigen_plain_assert(start &lt; <a class="codeRef" href="../group__Core__Module.html#ga0e45b6b2adead7c6a29815b99f9f14dd">end</a>);  <span class="comment">// non-zero sized partition</span></div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;    eigen_plain_assert(<a class="codeRef" href="../group__Core__Module.html#ga0e45b6b2adead7c6a29815b99f9f14dd">end</a> &lt;= num_threads_);</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;  }</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160; </div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;  <span class="keyword">inline</span> <span class="keywordtype">void</span> SetStealPartition(<span class="keywordtype">size_t</span> i, <span class="keywordtype">unsigned</span> val) {</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    thread_data_[i].steal_partition.store(val, std::memory_order_relaxed);</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;  }</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160; </div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;  <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> GetStealPartition(<span class="keywordtype">int</span> i) {</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;    <span class="keywordflow">return</span> thread_data_[i].steal_partition.load(std::memory_order_relaxed);</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;  }</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160; </div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;  <span class="keywordtype">void</span> ComputeCoprimes(<span class="keywordtype">int</span> N, MaxSizeVector&lt;unsigned&gt;* coprimes) {</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 1; i &lt;= N; i++) {</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;      <span class="keywordtype">unsigned</span> a = i;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;      <span class="keywordtype">unsigned</span> b = N;</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;      <span class="comment">// If GCD(a, b) == 1, then a and b are coprimes.</span></div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;      <span class="keywordflow">while</span> (b != 0) {</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;        <span class="keywordtype">unsigned</span> tmp = a;</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;        a = b;</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;        b = tmp % b;</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;      }</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;      <span class="keywordflow">if</span> (a == 1) {</div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;        coprimes-&gt;push_back(i);</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;      }</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;    }</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;  }</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160; </div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;  <span class="keyword">typedef</span> <span class="keyword">typename</span> Environment::EnvThread Thread;</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160; </div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;  <span class="keyword">struct </span>PerThread {</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;    constexpr PerThread() : pool(NULL), rand(0), thread_id(-1) {}</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;    ThreadPoolTempl* pool;  <span class="comment">// Parent pool, or null for normal threads.</span></div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;    uint64_t rand;          <span class="comment">// Random generator state.</span></div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;    <span class="keywordtype">int</span> thread_id;          <span class="comment">// Worker thread index in pool.</span></div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;<span class="preprocessor">#ifndef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;    <span class="comment">// Prevent false sharing.</span></div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;    <span class="keywordtype">char</span> pad_[128];</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;  };</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160; </div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;  <span class="keyword">struct </span>ThreadData {</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;    constexpr ThreadData() : thread(), steal_partition(0), queue() {}</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;    std::unique_ptr&lt;Thread&gt; thread;</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;    std::atomic&lt;unsigned&gt; steal_partition;</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;    Queue queue;</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;  };</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160; </div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;  Environment env_;</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;  <span class="keyword">const</span> <span class="keywordtype">int</span> num_threads_;</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;  <span class="keyword">const</span> <span class="keywordtype">bool</span> allow_spinning_;</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;  MaxSizeVector&lt;ThreadData&gt; thread_data_;</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;  MaxSizeVector&lt;MaxSizeVector&lt;unsigned&gt;&gt; all_coprimes_;</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;  MaxSizeVector&lt;EventCount::Waiter&gt; waiters_;</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;  <span class="keywordtype">unsigned</span> global_steal_partition_;</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;  std::atomic&lt;unsigned&gt; blocked_;</div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;  std::atomic&lt;bool&gt; spinning_;</div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;  std::atomic&lt;bool&gt; done_;</div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;  std::atomic&lt;bool&gt; cancelled_;</div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;  EventCount ec_;</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;<span class="preprocessor">#ifndef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;  std::unique_ptr&lt;Barrier&gt; init_barrier_;</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;  std::mutex per_thread_map_mutex_;  <span class="comment">// Protects per_thread_map_.</span></div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;  std::unordered_map&lt;uint64_t, std::unique_ptr&lt;PerThread&gt;&gt; per_thread_map_;</div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160; </div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;  <span class="comment">// Main worker thread loop.</span></div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;  <span class="keywordtype">void</span> WorkerLoop(<span class="keywordtype">int</span> thread_id) {</div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;<span class="preprocessor">#ifndef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;    std::unique_ptr&lt;PerThread&gt; new_pt(<span class="keyword">new</span> PerThread());</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;    per_thread_map_mutex_.lock();</div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;    <span class="keywordtype">bool</span> insertOK = per_thread_map_.emplace(GlobalThreadIdHash(), std::move(new_pt)).second;</div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;    eigen_plain_assert(insertOK);</div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    EIGEN_UNUSED_VARIABLE(insertOK);</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;    per_thread_map_mutex_.unlock();</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;    init_barrier_-&gt;Notify();</div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;    init_barrier_-&gt;Wait();</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;    PerThread* pt = GetPerThread();</div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;    pt-&gt;pool = <span class="keyword">this</span>;</div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;    pt-&gt;rand = GlobalThreadIdHash();</div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;    pt-&gt;thread_id = thread_id;</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;    Queue&amp; q = thread_data_[thread_id].queue;</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;    EventCount::Waiter* waiter = &amp;waiters_[thread_id];</div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;    <span class="comment">// TODO(dvyukov,rmlarsen): The time spent in NonEmptyQueueIndex() is</span></div>
<div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;    <span class="comment">// proportional to num_threads_ and we assume that new work is scheduled at</span></div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;    <span class="comment">// a constant rate, so we set spin_count to 5000 / num_threads_. The</span></div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;    <span class="comment">// constant was picked based on a fair dice roll, tune it.</span></div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> spin_count =</div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;        allow_spinning_ &amp;&amp; num_threads_ &gt; 0 ? 5000 / num_threads_ : 0;</div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;    <span class="keywordflow">if</span> (num_threads_ == 1) {</div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;      <span class="comment">// For num_threads_ == 1 there is no point in going through the expensive</span></div>
<div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;      <span class="comment">// steal loop. Moreover, since NonEmptyQueueIndex() calls PopBack() on the</span></div>
<div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;      <span class="comment">// victim queues it might reverse the order in which ops are executed</span></div>
<div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;      <span class="comment">// compared to the order in which they are scheduled, which tends to be</span></div>
<div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;      <span class="comment">// counter-productive for the types of I/O workloads the single thread</span></div>
<div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;      <span class="comment">// pools tend to be used for.</span></div>
<div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;      <span class="keywordflow">while</span> (!cancelled_) {</div>
<div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;        Task t = q.PopFront();</div>
<div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; spin_count &amp;&amp; !t.f; i++) {</div>
<div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;          <span class="keywordflow">if</span> (!cancelled_.load(std::memory_order_relaxed)) {</div>
<div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;            t = q.PopFront();</div>
<div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;          }</div>
<div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;        }</div>
<div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;        <span class="keywordflow">if</span> (!t.f) {</div>
<div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;          <span class="keywordflow">if</span> (!WaitForWork(waiter, &amp;t)) {</div>
<div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;            <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;          }</div>
<div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;        }</div>
<div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;        <span class="keywordflow">if</span> (t.f) {</div>
<div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;          env_.ExecuteTask(t);</div>
<div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;        }</div>
<div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;      }</div>
<div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;      <span class="keywordflow">while</span> (!cancelled_) {</div>
<div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;        Task t = q.PopFront();</div>
<div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;        <span class="keywordflow">if</span> (!t.f) {</div>
<div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;          t = LocalSteal();</div>
<div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;          <span class="keywordflow">if</span> (!t.f) {</div>
<div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;            t = GlobalSteal();</div>
<div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160;            <span class="keywordflow">if</span> (!t.f) {</div>
<div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;              <span class="comment">// Leave one thread spinning. This reduces latency.</span></div>
<div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;              <span class="keywordflow">if</span> (allow_spinning_ &amp;&amp; !spinning_ &amp;&amp; !spinning_.exchange(<span class="keyword">true</span>)) {</div>
<div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; spin_count &amp;&amp; !t.f; i++) {</div>
<div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;                  <span class="keywordflow">if</span> (!cancelled_.load(std::memory_order_relaxed)) {</div>
<div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;                    t = GlobalSteal();</div>
<div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;                  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;                    <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;                  }</div>
<div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;                }</div>
<div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;                spinning_ = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;              }</div>
<div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;              <span class="keywordflow">if</span> (!t.f) {</div>
<div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;                <span class="keywordflow">if</span> (!WaitForWork(waiter, &amp;t)) {</div>
<div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;                  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;                }</div>
<div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;              }</div>
<div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;            }</div>
<div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;          }</div>
<div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160;        }</div>
<div class="line"><a name="l00329"></a><span class="lineno">  329</span>&#160;        <span class="keywordflow">if</span> (t.f) {</div>
<div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;          env_.ExecuteTask(t);</div>
<div class="line"><a name="l00331"></a><span class="lineno">  331</span>&#160;        }</div>
<div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;      }</div>
<div class="line"><a name="l00333"></a><span class="lineno">  333</span>&#160;    }</div>
<div class="line"><a name="l00334"></a><span class="lineno">  334</span>&#160;  }</div>
<div class="line"><a name="l00335"></a><span class="lineno">  335</span>&#160; </div>
<div class="line"><a name="l00336"></a><span class="lineno">  336</span>&#160;  <span class="comment">// Steal tries to steal work from other worker threads in the range [start,</span></div>
<div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;  <span class="comment">// limit) in best-effort manner.</span></div>
<div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160;  Task Steal(<span class="keywordtype">unsigned</span> start, <span class="keywordtype">unsigned</span> limit) {</div>
<div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;    PerThread* pt = GetPerThread();</div>
<div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">size_t</span> size = limit - start;</div>
<div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;    <span class="keywordtype">unsigned</span> r = Rand(&amp;pt-&gt;rand);</div>
<div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;    <span class="comment">// Reduce r into [0, size) range, this utilizes trick from</span></div>
<div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;    <span class="comment">// https://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/</span></div>
<div class="line"><a name="l00344"></a><span class="lineno">  344</span>&#160;    eigen_plain_assert(all_coprimes_[size - 1].size() &lt; (1&lt;&lt;30));</div>
<div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;    <span class="keywordtype">unsigned</span> victim = ((uint64_t)r * (uint64_t)size) &gt;&gt; 32;</div>
<div class="line"><a name="l00346"></a><span class="lineno">  346</span>&#160;    <span class="keywordtype">unsigned</span> index = ((uint64_t) all_coprimes_[size - 1].size() * (uint64_t)r) &gt;&gt; 32;</div>
<div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;    <span class="keywordtype">unsigned</span> inc = all_coprimes_[size - 1][index];</div>
<div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160; </div>
<div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; size; i++) {</div>
<div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;      eigen_plain_assert(start + victim &lt; limit);</div>
<div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;      Task t = thread_data_[start + victim].queue.PopBack();</div>
<div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;      <span class="keywordflow">if</span> (t.f) {</div>
<div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;        <span class="keywordflow">return</span> t;</div>
<div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;      }</div>
<div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;      victim += inc;</div>
<div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;      <span class="keywordflow">if</span> (victim &gt;= size) {</div>
<div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;        victim -= size;</div>
<div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;      }</div>
<div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;    }</div>
<div class="line"><a name="l00360"></a><span class="lineno">  360</span>&#160;    <span class="keywordflow">return</span> Task();</div>
<div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;  }</div>
<div class="line"><a name="l00362"></a><span class="lineno">  362</span>&#160; </div>
<div class="line"><a name="l00363"></a><span class="lineno">  363</span>&#160;  <span class="comment">// Steals work within threads belonging to the partition.</span></div>
<div class="line"><a name="l00364"></a><span class="lineno">  364</span>&#160;  Task LocalSteal() {</div>
<div class="line"><a name="l00365"></a><span class="lineno">  365</span>&#160;    PerThread* pt = GetPerThread();</div>
<div class="line"><a name="l00366"></a><span class="lineno">  366</span>&#160;    <span class="keywordtype">unsigned</span> partition = GetStealPartition(pt-&gt;thread_id);</div>
<div class="line"><a name="l00367"></a><span class="lineno">  367</span>&#160;    <span class="comment">// If thread steal partition is the same as global partition, there is no</span></div>
<div class="line"><a name="l00368"></a><span class="lineno">  368</span>&#160;    <span class="comment">// need to go through the steal loop twice.</span></div>
<div class="line"><a name="l00369"></a><span class="lineno">  369</span>&#160;    <span class="keywordflow">if</span> (global_steal_partition_ == partition) <span class="keywordflow">return</span> Task();</div>
<div class="line"><a name="l00370"></a><span class="lineno">  370</span>&#160;    <span class="keywordtype">unsigned</span> start, limit;</div>
<div class="line"><a name="l00371"></a><span class="lineno">  371</span>&#160;    DecodePartition(partition, &amp;start, &amp;limit);</div>
<div class="line"><a name="l00372"></a><span class="lineno">  372</span>&#160;    AssertBounds(start, limit);</div>
<div class="line"><a name="l00373"></a><span class="lineno">  373</span>&#160; </div>
<div class="line"><a name="l00374"></a><span class="lineno">  374</span>&#160;    <span class="keywordflow">return</span> Steal(start, limit);</div>
<div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;  }</div>
<div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160; </div>
<div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160;  <span class="comment">// Steals work from any other thread in the pool.</span></div>
<div class="line"><a name="l00378"></a><span class="lineno">  378</span>&#160;  Task GlobalSteal() {</div>
<div class="line"><a name="l00379"></a><span class="lineno">  379</span>&#160;    <span class="keywordflow">return</span> Steal(0, num_threads_);</div>
<div class="line"><a name="l00380"></a><span class="lineno">  380</span>&#160;  }</div>
<div class="line"><a name="l00381"></a><span class="lineno">  381</span>&#160; </div>
<div class="line"><a name="l00382"></a><span class="lineno">  382</span>&#160; </div>
<div class="line"><a name="l00383"></a><span class="lineno">  383</span>&#160;  <span class="comment">// WaitForWork blocks until new work is available (returns true), or if it is</span></div>
<div class="line"><a name="l00384"></a><span class="lineno">  384</span>&#160;  <span class="comment">// time to exit (returns false). Can optionally return a task to execute in t</span></div>
<div class="line"><a name="l00385"></a><span class="lineno">  385</span>&#160;  <span class="comment">// (in such case t.f != nullptr on return).</span></div>
<div class="line"><a name="l00386"></a><span class="lineno">  386</span>&#160;  <span class="keywordtype">bool</span> WaitForWork(EventCount::Waiter* waiter, Task* t) {</div>
<div class="line"><a name="l00387"></a><span class="lineno">  387</span>&#160;    eigen_plain_assert(!t-&gt;f);</div>
<div class="line"><a name="l00388"></a><span class="lineno">  388</span>&#160;    <span class="comment">// We already did best-effort emptiness check in Steal, so prepare for</span></div>
<div class="line"><a name="l00389"></a><span class="lineno">  389</span>&#160;    <span class="comment">// blocking.</span></div>
<div class="line"><a name="l00390"></a><span class="lineno">  390</span>&#160;    ec_.Prewait();</div>
<div class="line"><a name="l00391"></a><span class="lineno">  391</span>&#160;    <span class="comment">// Now do a reliable emptiness check.</span></div>
<div class="line"><a name="l00392"></a><span class="lineno">  392</span>&#160;    <span class="keywordtype">int</span> victim = NonEmptyQueueIndex();</div>
<div class="line"><a name="l00393"></a><span class="lineno">  393</span>&#160;    <span class="keywordflow">if</span> (victim != -1) {</div>
<div class="line"><a name="l00394"></a><span class="lineno">  394</span>&#160;      ec_.CancelWait();</div>
<div class="line"><a name="l00395"></a><span class="lineno">  395</span>&#160;      <span class="keywordflow">if</span> (cancelled_) {</div>
<div class="line"><a name="l00396"></a><span class="lineno">  396</span>&#160;        <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00397"></a><span class="lineno">  397</span>&#160;      } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00398"></a><span class="lineno">  398</span>&#160;        *t = thread_data_[victim].queue.PopBack();</div>
<div class="line"><a name="l00399"></a><span class="lineno">  399</span>&#160;        <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00400"></a><span class="lineno">  400</span>&#160;      }</div>
<div class="line"><a name="l00401"></a><span class="lineno">  401</span>&#160;    }</div>
<div class="line"><a name="l00402"></a><span class="lineno">  402</span>&#160;    <span class="comment">// Number of blocked threads is used as termination condition.</span></div>
<div class="line"><a name="l00403"></a><span class="lineno">  403</span>&#160;    <span class="comment">// If we are shutting down and all worker threads blocked without work,</span></div>
<div class="line"><a name="l00404"></a><span class="lineno">  404</span>&#160;    <span class="comment">// that&#39;s we are done.</span></div>
<div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;    blocked_++;</div>
<div class="line"><a name="l00406"></a><span class="lineno">  406</span>&#160;    <span class="comment">// TODO is blocked_ required to be unsigned?</span></div>
<div class="line"><a name="l00407"></a><span class="lineno">  407</span>&#160;    <span class="keywordflow">if</span> (done_ &amp;&amp; blocked_ == <span class="keyword">static_cast&lt;</span><span class="keywordtype">unsigned</span><span class="keyword">&gt;</span>(num_threads_)) {</div>
<div class="line"><a name="l00408"></a><span class="lineno">  408</span>&#160;      ec_.CancelWait();</div>
<div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;      <span class="comment">// Almost done, but need to re-check queues.</span></div>
<div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160;      <span class="comment">// Consider that all queues are empty and all worker threads are preempted</span></div>
<div class="line"><a name="l00411"></a><span class="lineno">  411</span>&#160;      <span class="comment">// right after incrementing blocked_ above. Now a free-standing thread</span></div>
<div class="line"><a name="l00412"></a><span class="lineno">  412</span>&#160;      <span class="comment">// submits work and calls destructor (which sets done_). If we don&#39;t</span></div>
<div class="line"><a name="l00413"></a><span class="lineno">  413</span>&#160;      <span class="comment">// re-check queues, we will exit leaving the work unexecuted.</span></div>
<div class="line"><a name="l00414"></a><span class="lineno">  414</span>&#160;      <span class="keywordflow">if</span> (NonEmptyQueueIndex() != -1) {</div>
<div class="line"><a name="l00415"></a><span class="lineno">  415</span>&#160;        <span class="comment">// Note: we must not pop from queues before we decrement blocked_,</span></div>
<div class="line"><a name="l00416"></a><span class="lineno">  416</span>&#160;        <span class="comment">// otherwise the following scenario is possible. Consider that instead</span></div>
<div class="line"><a name="l00417"></a><span class="lineno">  417</span>&#160;        <span class="comment">// of checking for emptiness we popped the only element from queues.</span></div>
<div class="line"><a name="l00418"></a><span class="lineno">  418</span>&#160;        <span class="comment">// Now other worker threads can start exiting, which is bad if the</span></div>
<div class="line"><a name="l00419"></a><span class="lineno">  419</span>&#160;        <span class="comment">// work item submits other work. So we just check emptiness here,</span></div>
<div class="line"><a name="l00420"></a><span class="lineno">  420</span>&#160;        <span class="comment">// which ensures that all worker threads exit at the same time.</span></div>
<div class="line"><a name="l00421"></a><span class="lineno">  421</span>&#160;        blocked_--;</div>
<div class="line"><a name="l00422"></a><span class="lineno">  422</span>&#160;        <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00423"></a><span class="lineno">  423</span>&#160;      }</div>
<div class="line"><a name="l00424"></a><span class="lineno">  424</span>&#160;      <span class="comment">// Reached stable termination state.</span></div>
<div class="line"><a name="l00425"></a><span class="lineno">  425</span>&#160;      ec_.Notify(<span class="keyword">true</span>);</div>
<div class="line"><a name="l00426"></a><span class="lineno">  426</span>&#160;      <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00427"></a><span class="lineno">  427</span>&#160;    }</div>
<div class="line"><a name="l00428"></a><span class="lineno">  428</span>&#160;    ec_.CommitWait(waiter);</div>
<div class="line"><a name="l00429"></a><span class="lineno">  429</span>&#160;    blocked_--;</div>
<div class="line"><a name="l00430"></a><span class="lineno">  430</span>&#160;    <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00431"></a><span class="lineno">  431</span>&#160;  }</div>
<div class="line"><a name="l00432"></a><span class="lineno">  432</span>&#160; </div>
<div class="line"><a name="l00433"></a><span class="lineno">  433</span>&#160;  <span class="keywordtype">int</span> NonEmptyQueueIndex() {</div>
<div class="line"><a name="l00434"></a><span class="lineno">  434</span>&#160;    PerThread* pt = GetPerThread();</div>
<div class="line"><a name="l00435"></a><span class="lineno">  435</span>&#160;    <span class="comment">// We intentionally design NonEmptyQueueIndex to steal work from</span></div>
<div class="line"><a name="l00436"></a><span class="lineno">  436</span>&#160;    <span class="comment">// anywhere in the queue so threads don&#39;t block in WaitForWork() forever</span></div>
<div class="line"><a name="l00437"></a><span class="lineno">  437</span>&#160;    <span class="comment">// when all threads in their partition go to sleep. Steal is still local.</span></div>
<div class="line"><a name="l00438"></a><span class="lineno">  438</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">size_t</span> size = thread_data_.size();</div>
<div class="line"><a name="l00439"></a><span class="lineno">  439</span>&#160;    <span class="keywordtype">unsigned</span> r = Rand(&amp;pt-&gt;rand);</div>
<div class="line"><a name="l00440"></a><span class="lineno">  440</span>&#160;    <span class="keywordtype">unsigned</span> inc = all_coprimes_[size - 1][r % all_coprimes_[size - 1].size()];</div>
<div class="line"><a name="l00441"></a><span class="lineno">  441</span>&#160;    <span class="keywordtype">unsigned</span> victim = r % size;</div>
<div class="line"><a name="l00442"></a><span class="lineno">  442</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; size; i++) {</div>
<div class="line"><a name="l00443"></a><span class="lineno">  443</span>&#160;      <span class="keywordflow">if</span> (!thread_data_[victim].queue.Empty()) {</div>
<div class="line"><a name="l00444"></a><span class="lineno">  444</span>&#160;        <span class="keywordflow">return</span> victim;</div>
<div class="line"><a name="l00445"></a><span class="lineno">  445</span>&#160;      }</div>
<div class="line"><a name="l00446"></a><span class="lineno">  446</span>&#160;      victim += inc;</div>
<div class="line"><a name="l00447"></a><span class="lineno">  447</span>&#160;      <span class="keywordflow">if</span> (victim &gt;= size) {</div>
<div class="line"><a name="l00448"></a><span class="lineno">  448</span>&#160;        victim -= size;</div>
<div class="line"><a name="l00449"></a><span class="lineno">  449</span>&#160;      }</div>
<div class="line"><a name="l00450"></a><span class="lineno">  450</span>&#160;    }</div>
<div class="line"><a name="l00451"></a><span class="lineno">  451</span>&#160;    <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00452"></a><span class="lineno">  452</span>&#160;  }</div>
<div class="line"><a name="l00453"></a><span class="lineno">  453</span>&#160; </div>
<div class="line"><a name="l00454"></a><span class="lineno">  454</span>&#160;  <span class="keyword">static</span> EIGEN_STRONG_INLINE uint64_t GlobalThreadIdHash() {</div>
<div class="line"><a name="l00455"></a><span class="lineno">  455</span>&#160;    <span class="keywordflow">return</span> std::hash&lt;std::thread::id&gt;()(std::this_thread::get_id());</div>
<div class="line"><a name="l00456"></a><span class="lineno">  456</span>&#160;  }</div>
<div class="line"><a name="l00457"></a><span class="lineno">  457</span>&#160; </div>
<div class="line"><a name="l00458"></a><span class="lineno">  458</span>&#160;  EIGEN_STRONG_INLINE PerThread* GetPerThread() {</div>
<div class="line"><a name="l00459"></a><span class="lineno">  459</span>&#160;<span class="preprocessor">#ifndef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00460"></a><span class="lineno">  460</span>&#160;    <span class="keyword">static</span> PerThread dummy;</div>
<div class="line"><a name="l00461"></a><span class="lineno">  461</span>&#160;    <span class="keyword">auto</span> it = per_thread_map_.find(GlobalThreadIdHash());</div>
<div class="line"><a name="l00462"></a><span class="lineno">  462</span>&#160;    <span class="keywordflow">if</span> (it == per_thread_map_.end()) {</div>
<div class="line"><a name="l00463"></a><span class="lineno">  463</span>&#160;      <span class="keywordflow">return</span> &amp;dummy;</div>
<div class="line"><a name="l00464"></a><span class="lineno">  464</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00465"></a><span class="lineno">  465</span>&#160;      <span class="keywordflow">return</span> it-&gt;second.get();</div>
<div class="line"><a name="l00466"></a><span class="lineno">  466</span>&#160;    }</div>
<div class="line"><a name="l00467"></a><span class="lineno">  467</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00468"></a><span class="lineno">  468</span>&#160;    EIGEN_THREAD_LOCAL PerThread per_thread_;</div>
<div class="line"><a name="l00469"></a><span class="lineno">  469</span>&#160;    PerThread* pt = &amp;per_thread_;</div>
<div class="line"><a name="l00470"></a><span class="lineno">  470</span>&#160;    <span class="keywordflow">return</span> pt;</div>
<div class="line"><a name="l00471"></a><span class="lineno">  471</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00472"></a><span class="lineno">  472</span>&#160;  }</div>
<div class="line"><a name="l00473"></a><span class="lineno">  473</span>&#160; </div>
<div class="line"><a name="l00474"></a><span class="lineno">  474</span>&#160;  <span class="keyword">static</span> EIGEN_STRONG_INLINE <span class="keywordtype">unsigned</span> Rand(uint64_t* state) {</div>
<div class="line"><a name="l00475"></a><span class="lineno">  475</span>&#160;    uint64_t current = *state;</div>
<div class="line"><a name="l00476"></a><span class="lineno">  476</span>&#160;    <span class="comment">// Update the internal state</span></div>
<div class="line"><a name="l00477"></a><span class="lineno">  477</span>&#160;    *state = current * 6364136223846793005ULL + 0xda3e39cb94b95bdbULL;</div>
<div class="line"><a name="l00478"></a><span class="lineno">  478</span>&#160;    <span class="comment">// Generate the random output (using the PCG-XSH-RS scheme)</span></div>
<div class="line"><a name="l00479"></a><span class="lineno">  479</span>&#160;    <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><span class="keywordtype">unsigned</span><span class="keyword">&gt;</span>((current ^ (current &gt;&gt; 22)) &gt;&gt;</div>
<div class="line"><a name="l00480"></a><span class="lineno">  480</span>&#160;                                 (22 + (current &gt;&gt; 61)));</div>
<div class="line"><a name="l00481"></a><span class="lineno">  481</span>&#160;  }</div>
<div class="line"><a name="l00482"></a><span class="lineno">  482</span>&#160;};</div>
<div class="line"><a name="l00483"></a><span class="lineno">  483</span>&#160; </div>
<div class="line"><a name="l00484"></a><span class="lineno">  484</span>&#160;<span class="keyword">typedef</span> ThreadPoolTempl&lt;StlThreadEnvironment&gt; ThreadPool;</div>
<div class="line"><a name="l00485"></a><span class="lineno">  485</span>&#160; </div>
<div class="line"><a name="l00486"></a><span class="lineno">  486</span>&#160;}  <span class="comment">// namespace Eigen</span></div>
<div class="line"><a name="l00487"></a><span class="lineno">  487</span>&#160; </div>
<div class="line"><a name="l00488"></a><span class="lineno">  488</span>&#160;<span class="preprocessor">#endif  </span><span class="comment">// EIGEN_CXX11_THREADPOOL_NONBLOCKING_THREAD_POOL_H</span></div>
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